EP1847008A1 - Switching converter - Google Patents

Switching converter

Info

Publication number
EP1847008A1
EP1847008A1 EP06707812A EP06707812A EP1847008A1 EP 1847008 A1 EP1847008 A1 EP 1847008A1 EP 06707812 A EP06707812 A EP 06707812A EP 06707812 A EP06707812 A EP 06707812A EP 1847008 A1 EP1847008 A1 EP 1847008A1
Authority
EP
European Patent Office
Prior art keywords
inductance
voltage
output voltage
switching transistor
switching
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06707812A
Other languages
German (de)
French (fr)
Other versions
EP1847008B1 (en
Inventor
Reinhard Kögel
Jean-Paul Louvel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
THOMSON LICENSING
Original Assignee
Thomson Licensing SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson Licensing SAS filed Critical Thomson Licensing SAS
Publication of EP1847008A1 publication Critical patent/EP1847008A1/en
Application granted granted Critical
Publication of EP1847008B1 publication Critical patent/EP1847008B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators

Definitions

  • the present invention relates to a switching converter having a switching transistor, an inductance and a diode, and to a television set having a respective converter .
  • Switching converters of this type are often used, for example, in consumer electronics appliances in order to provide a further supply voltage, in addition to the supply voltages produced by a switched- mode power supply unit .
  • Switching converters according to the prior art are known, for example, as step-up converters , step-down converters or inverse converters . Circuits of this type are illustrated schematically in Figures Ia, Ib and Ic .
  • Figure Ia shows a step-down converter having a switching transistor Tl , which is connected at the emitter to a DC voltage UEl and at the collector to a coil Ll . Furthermore, a diode Dl , whose anode is connected to earth, is connected to the collector .
  • a capacitor Cl connected to earth, is connected to the inductance Ll and provides a supply voltage UAl for a load RLl .
  • the base of the switching transistor Tl is in this case controlled via a feedback circuit and a regulating circuit (not illustrated) , for example by means of a PWM signal, such that the output voltage UAl is stabilized as a function of the load RLl .
  • Figure Ib illustrates a step-up converter which has a coil L2 , which is connected on the input side to a DC voltage UE2 , and a switching transistor T2 , which is connected on the collector side to the output of the coil L2 and on the emitter side to earth . Furthermore, a diode D2 is connected to the collector of the switching transistor T2 and provides , on the output side, a rectified supply voltage UA2 via a capacitor C2 for the purpose of supplying a load RL2.
  • Figure Ic illustrates an inverse converter having a switching transistor T3, a coil L3 and a diode D3 for the purpose of producing an output voltage UA3 which has an inverted polarity with respect to the input voltage UE3.
  • the switching converter according to the invention has a switching transistor, an inductance and a diode, which are arranged as a step-down converter for generating a first rectified output voltage from a rectified input voltage .
  • the switching transistor is connected on the input side to the input voltage via a second inductance, and a second diode is coupled on the anode side to a tap arranged between the second inductance and the switching transistor for the purpose of producing a second output voltage .
  • the second output voltage is in this case a rectified voltage which is higher than the input voltage .
  • the switching transistor is , for example, part of an integrated circuit or is coupled to an integrated driver circuit for the purpose of producing a regulated first output voltage .
  • the second output voltage is in this case not regulated because the switching transistor is clocked as a function of the loading of the first output voltage, for example by means of a PWM signal .
  • the second output voltage can be used, in particular, for producing the +40 Volt voltage which is required by respective tuners for tuning of capacitance diodes .
  • the first output voltage can be used, in particular, for the purpose of supplying integrated circuits which require a very low supply voltage of, for example, 3.3 Volts , 2.5 Volts or 1.8 Volts .
  • a supply voltage of an already existing switched-mode power supply unit can be used as the input voltage for the switching converter .
  • the switching converter according to the invention provides a cost- effective alternative for producing the tuning voltage of the tuner .
  • Figure Ia shows a step-down converter according to the prior art
  • Figure Ib shows a step-up converter according to the prior art
  • Figure Ic shows an inverse converter according to the prior art
  • Figure 2 shows a switching converter according to the invention for the purpose of producing two output voltages .
  • FIG. 2 illustrates a switching converter having a switching transistor T4 which is integrated, in this exemplary embodiment, in an integrated circuit ICl .
  • the circuit ICl is , for example, an integrated circuit - A -
  • MC34064 which can be acquired, for example, from ON Semiconductors , and contains control and supervisory circuits for the operation of the switching transistor T4.
  • a MOSFET can also be used as the switching transistor T4.
  • the switching transistor T4 is connected on the input side to a rectified input voltage UE4 and on the output side to earth via a diode D4.
  • An inductance L4 in this exemplary embodiment a coil, is connected to the output of the switching transistor T4 and is connected at its other end to a charging capacitor C4.
  • the diode D4 is connected to earth at its anode; the circuit is therefore connected so as to form a step- down converter and, in this exemplary embodiment, produces a rectified output voltage UA4 of +3.3 Volts at the charging capacitor C4 from a +9 Volt DC voltage .
  • the output voltage UA4 is stabilized via a feedback loop FB .
  • a regulating signal containing information on the output voltage UA4 which is applied via the capacitor C4 , is fed back to a regulating input of the integrated circuit ICl .
  • This circuit is known to this extent as a step-down converter .
  • a second inductance L5, in particular a coil, is arranged between the current input of the switching transistor T4 and the input voltage UE4.
  • the inductance value of the inductance L5 is less than the inductance of the first inductance L4 , and is preferably less than 30%, only 10% in the exemplary embodiment in Figure 2.
  • the operation of the step-down converter for producing the output voltage UA4 is not impaired thereby .
  • the inductance L5 brings about a voltage drop if the switching transistor T4 is on . This voltage drop should, however, not be so great that it disrupts the operation of the step-down converter for producing the output voltage UA4.
  • a diode D5 is connected to the inductance L5 at its cathode and is connected at its anode to a second charging capacitor C5, which is connected to earth, for the purpose of producing a second rectified output voltage UA5.
  • the cathode of the diode D5 is coupled to a tap A being arranged between the inductance L5 and the switching transistor T4.
  • This circuit functions as follows : If the switching transistor T4 is on, a current flows through the inductance L5 and causes a magnetic field to be built up . If the switching transistor T4 is off, an induced voltage is produced via the inductance L5, and this induced voltage charges the capacitor C5 via the diode D5. The switching transistor T4 therefore functions , together with the inductance L5 and the diode D5, as a step-up converter . The switching converter therefore produces two output voltages UA4 and UA5 simultaneously, of which the output voltage UA5 is higher and the output voltage UA4 is lower than the input voltage UE4.
  • the output voltage UA5 is in this case not regulated and depends , in particular, on the duty ratio at which the switching transistor T4 is operated. Since the inductance value of the inductance L5 is low, only a load having a low power consumption can be connected to the output voltage UA5.
  • the switching converter is therefore expedient for specific application areas . It can be used, in particular, in television receivers , for example in television sets and video recorders which require an unregulated operating voltage of approximately 40 volts for operation of the respective tuner .
  • a stabilization circuit is generally provided for the purpose of producing the +33 volt or +30 volt voltage for the capacitance diodes used for tuning purposes .
  • An unregulated supply voltage in the range of approximately 40 - 50 volts is therefore sufficient .
  • An output voltage UA5 with this range can be produced by appropriately selecting the inductance of the coil L5, in particular if the output voltage UA4 is used for supplying a constant load.
  • the output voltage UA4 can advantageously be used for supplying digital circuits which require an unregulated supply voltage of +3.3 Volts , 2.5 Volts or less .
  • Supply voltages of this nature can often not be supplied by conventional flyback-converter switched-mode power supply units with sufficient stability .
  • the switching converter is therefore provided in particular as an addition to a switched-mode power supply unit which is already provided in a television receiver and at the same time provides the input voltage UE4 for the switching converter .

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Television Receiver Circuits (AREA)

Abstract

The switching converter contains a switching transistor (T4), a first inductance (L4) and a first diode (D4), which are connected so as to form a step-down converter for the purpose of producing a first rectified output voltage (UA4) from an input voltage (UE4) . The switching transistor (T4) is connected on the input side to the input voltage (UE4) via a second inductance (L5) , and a second diode (D5) is coupled to a tap (A) being arranged between the second inductance (L5) and the switching transistor (T4) for the purpose of producing a second rectified output voltage (UA5) . The second rectified output voltage is in this case unregulated, but can be used in particular as a supply voltage for a television tuner.

Description

Switching converter
BACKGROUND OF THE INVENTION AND PRIOR ART
The present invention relates to a switching converter having a switching transistor, an inductance and a diode, and to a television set having a respective converter . Switching converters of this type are often used, for example, in consumer electronics appliances in order to provide a further supply voltage, in addition to the supply voltages produced by a switched- mode power supply unit .
Switching converters according to the prior art are known, for example, as step-up converters , step-down converters or inverse converters . Circuits of this type are illustrated schematically in Figures Ia, Ib and Ic . Figure Ia shows a step-down converter having a switching transistor Tl , which is connected at the emitter to a DC voltage UEl and at the collector to a coil Ll . Furthermore, a diode Dl , whose anode is connected to earth, is connected to the collector .
On the output side, a capacitor Cl , connected to earth, is connected to the inductance Ll and provides a supply voltage UAl for a load RLl . The base of the switching transistor Tl is in this case controlled via a feedback circuit and a regulating circuit (not illustrated) , for example by means of a PWM signal, such that the output voltage UAl is stabilized as a function of the load RLl .
Figure Ib illustrates a step-up converter which has a coil L2 , which is connected on the input side to a DC voltage UE2 , and a switching transistor T2 , which is connected on the collector side to the output of the coil L2 and on the emitter side to earth . Furthermore, a diode D2 is connected to the collector of the switching transistor T2 and provides , on the output side, a rectified supply voltage UA2 via a capacitor C2 for the purpose of supplying a load RL2.
Figure Ic illustrates an inverse converter having a switching transistor T3, a coil L3 and a diode D3 for the purpose of producing an output voltage UA3 which has an inverted polarity with respect to the input voltage UE3.
SUMMARY OF THE INVENTION
The switching converter according to the invention has a switching transistor, an inductance and a diode, which are arranged as a step-down converter for generating a first rectified output voltage from a rectified input voltage . The switching transistor is connected on the input side to the input voltage via a second inductance, and a second diode is coupled on the anode side to a tap arranged between the second inductance and the switching transistor for the purpose of producing a second output voltage . The second output voltage is in this case a rectified voltage which is higher than the input voltage .
The switching transistor is , for example, part of an integrated circuit or is coupled to an integrated driver circuit for the purpose of producing a regulated first output voltage . The second output voltage is in this case not regulated because the switching transistor is clocked as a function of the loading of the first output voltage, for example by means of a PWM signal . For specific uses , for example in television sets or other consumer electronics appliances which have a tuner, this is not a disadvantage, however . In this case, the second output voltage can be used, in particular, for producing the +40 Volt voltage which is required by respective tuners for tuning of capacitance diodes . The first output voltage can be used, in particular, for the purpose of supplying integrated circuits which require a very low supply voltage of, for example, 3.3 Volts , 2.5 Volts or 1.8 Volts .
In this case, a supply voltage of an already existing switched-mode power supply unit can be used as the input voltage for the switching converter . In particular if all of the connection pins provided for output voltages of the transformer of the switched-mode power supply unit are already occupied, the switching converter according to the invention provides a cost- effective alternative for producing the tuning voltage of the tuner .
BRIEF DESCRIPTION OF THE FIGURES
The invention will be explained, by way of example, in more detail below, with reference to a schematic circuit diagram. In the figures :
Figure Ia shows a step-down converter according to the prior art, Figure Ib shows a step-up converter according to the prior art, Figure Ic shows an inverse converter according to the prior art, and
Figure 2 shows a switching converter according to the invention for the purpose of producing two output voltages .
DESCRIPTION OF PREFERRED EMBODIMENTS
Figure 2 illustrates a switching converter having a switching transistor T4 which is integrated, in this exemplary embodiment, in an integrated circuit ICl . The circuit ICl is , for example, an integrated circuit - A -
MC34064 , which can be acquired, for example, from ON Semiconductors , and contains control and supervisory circuits for the operation of the switching transistor T4. In particular, a MOSFET can also be used as the switching transistor T4.
The switching transistor T4 is connected on the input side to a rectified input voltage UE4 and on the output side to earth via a diode D4. An inductance L4 , in this exemplary embodiment a coil, is connected to the output of the switching transistor T4 and is connected at its other end to a charging capacitor C4.
The diode D4 is connected to earth at its anode; the circuit is therefore connected so as to form a step- down converter and, in this exemplary embodiment, produces a rectified output voltage UA4 of +3.3 Volts at the charging capacitor C4 from a +9 Volt DC voltage . The output voltage UA4 is stabilized via a feedback loop FB . In this case, a regulating signal containing information on the output voltage UA4 , which is applied via the capacitor C4 , is fed back to a regulating input of the integrated circuit ICl . This circuit is known to this extent as a step-down converter .
According to the invention, a second inductance L5, in particular a coil, is arranged between the current input of the switching transistor T4 and the input voltage UE4. The inductance value of the inductance L5 is less than the inductance of the first inductance L4 , and is preferably less than 30%, only 10% in the exemplary embodiment in Figure 2. The operation of the step-down converter for producing the output voltage UA4 is not impaired thereby . The inductance L5 brings about a voltage drop if the switching transistor T4 is on . This voltage drop should, however, not be so great that it disrupts the operation of the step-down converter for producing the output voltage UA4. Furthermore, a diode D5 is connected to the inductance L5 at its cathode and is connected at its anode to a second charging capacitor C5, which is connected to earth, for the purpose of producing a second rectified output voltage UA5. The cathode of the diode D5 is coupled to a tap A being arranged between the inductance L5 and the switching transistor T4.
This circuit functions as follows : If the switching transistor T4 is on, a current flows through the inductance L5 and causes a magnetic field to be built up . If the switching transistor T4 is off, an induced voltage is produced via the inductance L5, and this induced voltage charges the capacitor C5 via the diode D5. The switching transistor T4 therefore functions , together with the inductance L5 and the diode D5, as a step-up converter . The switching converter therefore produces two output voltages UA4 and UA5 simultaneously, of which the output voltage UA5 is higher and the output voltage UA4 is lower than the input voltage UE4.
The output voltage UA5 is in this case not regulated and depends , in particular, on the duty ratio at which the switching transistor T4 is operated. Since the inductance value of the inductance L5 is low, only a load having a low power consumption can be connected to the output voltage UA5. The switching converter is therefore expedient for specific application areas . It can be used, in particular, in television receivers , for example in television sets and video recorders which require an unregulated operating voltage of approximately 40 volts for operation of the respective tuner .
In television tuners today, a stabilization circuit is generally provided for the purpose of producing the +33 volt or +30 volt voltage for the capacitance diodes used for tuning purposes . An unregulated supply voltage in the range of approximately 40 - 50 volts is therefore sufficient . An output voltage UA5 with this range can be produced by appropriately selecting the inductance of the coil L5, in particular if the output voltage UA4 is used for supplying a constant load.
The output voltage UA4 can advantageously be used for supplying digital circuits which require an unregulated supply voltage of +3.3 Volts , 2.5 Volts or less . Supply voltages of this nature can often not be supplied by conventional flyback-converter switched-mode power supply units with sufficient stability . The switching converter is therefore provided in particular as an addition to a switched-mode power supply unit which is already provided in a television receiver and at the same time provides the input voltage UE4 for the switching converter .

Claims

Patent Claims
1. Switching converter having a switching transistor (T4 ) , a first inductance (L4 ) and a first diode (D4 ) being arranged as a step-down converter for producing a first rectified output voltage (UA4 ) from an input voltage (UE4 ) , characterized in that the switching transistor (T4 ) is coupled with an input terminal to the input voltage (UE4 ) via a second inductance (L5) , and in that a second diode (D5) is coupled to a tap (A) being arranged between the second inductance (L5) and the switching transistor (T4 ) for producing a second rectified output voltage (UA5) .
2. Switching converter according to Claim 1 , characterized in that the power supply has a control circuit (ICl ) and a feedback loop (FB) for stabilizing the first output voltage (UA4 ) .
3. Switching converter according to Claim 1 or 2 , characterized in that the second diode (D5) is connected on the anode side to the second inductance (L5) for producing a second output voltage (UA5) , which is higher than the input voltage (UE4 ) .
4. Switching converter according to Claim 1 , 2 or 3 characterized in that the inductance value of the second inductance (L5) is less than 30% of the value of the first inductance (L4 ) .
5. Television receiver, characterized in that it has a switching converter according to one of the preceding claims .
6. Television receiver according to Claim 5, characterized in that the television receiver has a switched-mode power supply unit generating the input voltage (UE4 ) for the switching converter, and in that the television receiver has a tuner which is connected to the second output voltage (UA5) .
7. Television receiver according to Claim 6, characterized in that the second output voltage (UA5) is usable as a tuning voltage for the tuner .
EP06707812A 2005-02-09 2006-01-24 Switching converter Expired - Fee Related EP1847008B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005005872A DE102005005872A1 (en) 2005-02-09 2005-02-09 Clocked power supply
PCT/EP2006/050395 WO2006084789A1 (en) 2005-02-09 2006-01-24 Switching converter

Publications (2)

Publication Number Publication Date
EP1847008A1 true EP1847008A1 (en) 2007-10-24
EP1847008B1 EP1847008B1 (en) 2009-04-15

Family

ID=36384373

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06707812A Expired - Fee Related EP1847008B1 (en) 2005-02-09 2006-01-24 Switching converter

Country Status (7)

Country Link
US (1) US20080116867A1 (en)
EP (1) EP1847008B1 (en)
JP (1) JP2008530965A (en)
KR (1) KR20070101873A (en)
CN (1) CN100557931C (en)
DE (2) DE102005005872A1 (en)
WO (1) WO2006084789A1 (en)

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CN106370857A (en) 2008-10-21 2017-02-01 阿斯图特医药公司 Methods and compositions for diagnosis and prognosis of renal injury and renal failure
US20110084552A1 (en) * 2009-10-14 2011-04-14 Energy Micro AS Power Management Methodology
DE102011075985B4 (en) * 2011-05-17 2018-02-22 Physik Instrumente (Pi) Gmbh & Co. Kg inverter
TW202015304A (en) * 2018-09-26 2020-04-16 義大利商埃格特羅尼克工程（股份）責任有限公司 Apparatus for transferring electrical power to an electrical load with converter

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US5412308A (en) * 1994-01-06 1995-05-02 Hewlett-Packard Corporation Dual voltage power supply
JPH0956150A (en) * 1995-08-11 1997-02-25 Nippon Steel Corp Switching power supply
US5886508A (en) * 1997-08-29 1999-03-23 Computer Products, Inc. Multiple output voltages from a cascaded buck converter topology
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Also Published As

Publication number Publication date
CN100557931C (en) 2009-11-04
CN101116240A (en) 2008-01-30
EP1847008B1 (en) 2009-04-15
JP2008530965A (en) 2008-08-07
US20080116867A1 (en) 2008-05-22
KR20070101873A (en) 2007-10-17
DE602006006289D1 (en) 2009-05-28
DE102005005872A1 (en) 2006-08-10
WO2006084789A1 (en) 2006-08-17

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